ONL673L4 8/15
19
Servicing
Figure 7:
673 Fuel System.
SP10. BLEEDING THE FUEL SYSTEM
CAUTION: Escaping diesel fuel under pressure can penetrate skin causing serious personal
injury. Before disconnecting lines be sure to relieve all pressure. Before applying pressure, be sure
all connections are tight and lines, pipes and hoses aren't damaged. Fuel escaping from a very
small hole can be almost invisible. Use a piece of cardboard or wood, rather than hands, to search
for suspected leaks. If injured by escaping fuel, see a doctor at once. Serious infection or reaction
can develop if proper medical treatment isn't administered immediately.
1. The fuel system is self-bleeding. However, any
system may need manual bleeding when:
a. A new fuel filter is installed;
b. The engine has run out of fuel;
c. The fuel lines, injection pump or any other fuel
system component has been removed and installed.
2. Loosen bleed screw “A” (
Figure 7
) on top of the
filter. Pump hand primer “B” on fuel lift pump until
pure fuel (no bubbles) escapes from bleed screw
“A”. Tighten bleed screw “A”.
3. Loosen bleed screw “C”. Pump hand primer “B” on
fuel lift pump until pure fuel (no bubbles) escapes
from bleed screw “A”.
4. If the engine does not start after the above
bleeding process, loosen a fuel line at the
injector. Crank the engine until pure fuel escapes,
then tighten the connection. Do each line
one at a
time.
5. After the engine has started, check for fuel leaks
using a piece of cardboard.
